Diablo III expansion Reaper of Souls shifted 2.7 million units in its first week on sale, Blizzard has announced.
The expansion went on sale just over a week ago, March 25, on PC and Mac, and Blizzard has counted both physical and digital sales.
Blizzard also adds that Act V's final boss has been taken down over 1.5 million times (I'm responsible for at least 5 of those, by the way), and that the game saw 2.4 million views on video streaming site Twitch in its first day on sale.
Diablo III itself has racked up over 15 million sales since its launch in 2012, with that figure including the Xbox 360 and PlayStation 3 versions alongside the Mac and PC. That means roughly a fifth of all Diablo III owners have purchased Reaper of Souls, and the expansion will make its way to consoles later this year.
"With Reaper of Souls, we wanted to emphasize all the things that Diablo gamers have always loved about the series, from the dark gothic setting to the piles and piles of epic loot," said Blizzard CEO Mike Morhaime.
"We're excited to see that players are enjoying the changes we've made to the game, and we look forward to achieving our Paragon levels alongside everyone else in the weeks and months ahead."
Reaper of Souls introduces a new act, a new character class, and a new adventure mode into Diablo III, as well as its new loot and difficulty settings which have been rolled back into the main game.
GameSpot spoke to Diablo III lead producer Alex Mayberry last week about the development of Reaper of Souls.